Abstract
Mesostigma virideLauterborn (Prasinophyceae) is the first green flagellate found to have multilayered structures (MLS) in its flagellar apparatus. MLS's were previously known from green algae only in charophycean swarmers, linking theCharophyceae to the origin of land plants, whose male gametes (when flagellated) also possess an MLS.M. viride is, therefore, probably more closely related to the origin of theCharophyceae than any other green flagellate that has been thoroughly studied so far. The occurrence of MLS's in green flagellates and apparently in other algae and protozoans suggests that an MLS occurred in an ancient group of flagellates and has survived in various protistan lines, including the line of green algae related to land plants. The occurrence of a synistosome inM. viride and other of its characteristics suggest that it is more closely related toPyramimonas than to other genera of scaly green flagellates.
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